Question 76
What is the main role of flow control at the data-link layer?
Detailed Solution
Flow control regulates the sender so the receiver can process incoming frames.
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GATE CSE Introduction to Computer Networks – CN Practice Test | Set 1
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Question 77
Which error-detection method appends a remainder obtained from polynomial division?
Detailed Solution
CRC computes a polynomial-division remainder and appends it to the frame.
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Question 78
For a code with minimum Hamming distance 5, how many bit errors can it guarantee to correct?
Detailed Solution
A minimum distance d can correct floor((d-1)/2) errors; for $d=5$, this is 2.
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Question 79
For a code with minimum Hamming distance 6, how many bit errors can it guarantee to detect?
Detailed Solution
A code with $d_{min}=6 can detect up$ to $d_{min}$-1 = 5 errors.
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Question 80
In Stop-and-Wait ARQ, why are sequence numbers used?
Detailed Solution
Sequence numbers let the receiver distinguish new frames from duplicates.
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